BU9728 View Datasheet(PDF) - ROHM Semiconductor

Part Name

Description

Manufacturer

BU9728

For 128～ 140 Segment type LCD, LCD Segment Driver

ROHM Semiconductor 

○ Display control (DISCTL)

MSB

LSB

D7 D6 D5 D4 D3 D2 D1 D0

C 0 1 P4 P3 P2 P1 P0

Set Frame frequency

Setting

80Hz

71Hz

64Hz

53Hz

P4

P3 Reset initialize condition

0

0

○

0

1

1

0

1

1

Set LCD drive waveform

Setting

P2

Line inversion

0

Frame inversion

1

Reset initialize condition

○

Set Power save mode

Setting

P1 P0 Reset initialize condition

Power save mode 1 0 0

Power save mode 2 0 1

Normal mode

10

○

High power mode

11

＊ VDD-VLCD>=3.0V is required for High power mode.

○ Set IC Operation (ICSET)

MSB

LSB

D7 D6 D5 D4 D3 D2 D1 D0

C 1 1 0 1 P2 P1 P0

P2: MSB data of DDRAM address. Please refer to “ADSET” command.

Setting

Address MSB‘0’

Address MSB‘1’

P2 Reset initialize condition

0

○

1

Set Software Reset condition

Setting

P1

No operation

0

Software Reset

1

Switch between internal clock and external clock.

Setting

P0 Reset initialize condition

Internal clock

0

○

External clock input

1

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